Lecture7.pptx

Lecture7.pptx - 1/26/11 1 PHYS 360 Quantum Mechanics Wed...

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Unformatted text preview: 1/26/11 1 PHYS 360 Quantum Mechanics Wed Jan 26, 2011 Lecture 7: Why do parCcles act like waves , and what then is their wavelength ? QuesCons: 1. How do we know that a beam of light transports energy? QuesCons: 1. How do we know that a beam of light transports energy? 2. How do we know that a beam of light transports momentum? QuesCons: 1. How do we know that a beam of light transports energy? 2. How do we know that a beam of light transports momentum? When light scaers oF a freeoaCng object, it recoils. By applying conservaCon of linear momentum, we deduce the momentum of the light. TheoreCcally, Maxwells equaCons nd that the energy transported (per unit Cme, unit area, etc) is related to the momentum by: E = cp 3. Why do we think that light is actually made up of parCcles, which we call photons? 3. Why do we think that light is actually made up of parCcles, which we call photons? Plancks theory for blackbody radiaCon Einsteins theory of the photoelectric eFect ompton eFect, the inelasCc scaering of photons oF of electrons. PlanckEinstein relaCon for a single photon: E = hf = hc (since c = f ) 1/26/11 2 Wait a minute. If Maxwell says a beam of light has energy and momentum such that: E = cp and Planck & Einstein say that a parCcle of light has...
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Lecture7.pptx - 1/26/11 1 PHYS 360 Quantum Mechanics Wed...

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